Power chain saw frame and jointing block therefor



A. B. MYERS 2,405,365

POWER CHAIN 'SAW FRAME AND JOINTING BLOCK THEREFOR Filed March 2o, 1945v 2 sheets-sheet 1 Irl i Invlentor A 4Ar't hur lBM ye rs wmy- Aug.' 6,1946. A. B. MYERS 2,405,365

POWER CHAIN SAW FRAME AND JOINTIG .BLCK THEREFOR Fil'ed Marchl 20, 19452 Sheets-Sheet 2` Patented Aug. 6, 1946 POWER CHAIN SAW FRAME ANDJOINTING BLOCK THEREFOR This invention relates to a power chain sawframe, and a jointing block therefor.

A primary object oi the invention is the prdvision of an improved chainsaw frame adapted to facilitate the jointing and ling oi chain saws insuch manner as to reduce the time and effort normally required for sucha job to a minimum.

An additional and very important object or this invention is theprovision of an improved jointing block, characterized by a plurality ofindividually and collectively adjustable members so arranged that thedifferent types of teeth on a chain saw may be leveled or jointed forthe entire length of the saw by a single adjustment of the jointingblock.

An additional object of the invention is the provision in a chain sawframe oi means for selectively moving the chain saw through the jointingblock a predetermined distance by movement of an appropriate lever orsimilar mechanism.

As conducive to a clearer understanding of this invention, it may herebe pointed out that the average chain saw is comprised of a number oitypes of teeth, normally set in blocks of four, such blocks of fourconsisting, for example, of a right cutter tooth, an outside raker tooth(either right or left, alternately arranged in successive blocks), aleft cutter tooth, and a center raker tooth. In jointing a saw, it ispreferable, in order to insure maximum efficiency in the operation ofthe device, that all cutterteeth be of exactly the same height orlength, that the side raliers be of a slightly lesser length, and thatthe center rakers be still shorter. Accordingly, in jointing a saw ithas hitherto been necessary, while using a jointing block, to pass thesaw through the block three times, adjusting the same between eachoperation for the different types of teeth. By means of the instantinvention the block may be set once, the various component parts thereofbeing adjusted to the different heights of the diiferent types of teeth,and the saw completely jointed by running the same through only once, adiilerent adjustment being provided for each type of tooth.Additionally, by the provision of a ratchet mechanism to be hereinafterdescribed, the chain may be moved forward successively in the saw fra-mea length equivalent to each block ci four teeth, in such manner thatsuccessive blocks will be appropriately aligned with the jointing blockin such manner that each type of tooth may be leveled to the desiredextent. Additionally, by means of the frame of the instant invention,the chain may be led after jointing from either side of the frame alongsubstantially the entire length thereof.

Still another object of the invention resides in the provision of such adevice which will be sturdy and durable in construction, reliable andeilicient in operation, vand comparatively simple and inexpensive tomanufacture and assemble.

Other objects reside in the combinations of elements, arrangements ofparts and features of construction, all as will be more fully pointedout hereinafter'and disclosed in the accompanying drawings, whereinthere is shown a preferred embodiment oi this inventive concept.

In the drawings:

Figure 1 is a side elevational view oi one form of saw frame constructedin accordance with this invention, certain parts thereof being brokenaway, and certain other parts being indicated in dotted lines.

Figure 2 is an enlarged fragmentary bottom elevational viewof a portionof the structure shown in Figure l disclosing the bottom of the jointingblock.

Figure 3 is a side elevational View of the jointing block, certainconcealed portions thereof being indicated in dotted lines.

Figure 4 is a sectional viewtalren substantially along the line 4 4 ofvFigure 3.

Figure 5 is a sectional view taken substantially along'the line 5 5 ofFigure.

Figure 6 is a sectional view taken substantially along the line 5--5 ofFigure l,`as viewed in the direction indicated by the arrows, and

Figure '7 is a sectional view taken substantially along the line l-l ofFigure 6, as viewed in the direction indicated by the arrows.

Similar reference characters refer to similar parts throughout theseveral views of the drawings.

Having reference now to the drawings, suitable supports Mi carry a guide`ll upon which a chain saw l2 is adapted to be positioned for jointingand sharpening. The guard ll is comprised of a' pair of spaced membersI3, having a groove therebetween, and secured in related assembly, as bybolts it. One .extremity oi the member I l carries a removable extensionl5 secured thereto, as by bolts Hi, at the extremity of which isrotatably mounted, as on an aXle il', a grooved pulley lil serving tosupport the saw l2. The opposite end of the vguide ll carries a sprocketwheel i9, mounted for rotation, as on an axle 26. The axle 2t alsocarries exteriorly of the guide l l a ratchet 2l and a handle 22 onwhich is pivotally mounted a pawl 23 spring pressed, as by a 3 leafspring 24, toward the ratchet 2|. Thus, it will be seen that movement ofthe operating handle 22 serves by rotation of the sprocket I9 to advancethe chain a predetermined distance for a purpose to be more fullydescribed hereinafter.

A pulley 38 is positioned adjacent the extremity of the guide and may beutilized in place of the pulley I8 when jointing saws of sharterlengths.

The chain is held taut and in position on the guide, as by means of aguide pulley 3|, mounted on an axle 32, carried by a supporting member33 hingedly secured, as by a hinge 34, to one of the supporting postsI9. A relatively heavy tension spring 35 secured at its oppositeextremities to one end of the member 33 and a lower portion of thesupporting posts below the hinge 34 serves to bias the guide pulley 3|downwardly in such manner as to tauten the chain regardless of thelength thereof within the limits of the d size of the frame.

The joining block of the instant invention, generally indicated at 40,is positioned at a desirable point on the guide and includes a spacedplate 4|, to which are secured, as by screws 42, oppositely disposedbase pairs of side members 43. Each of the plates 43 is substantiallythe width of a saw tooth, and the pairs of plates are spaced apart thewidth of an additional tooth. This space is occupied by a further pairof plates 44, and a still further pair of plates 45 is positioned at anend of the assembly beyond one of the pairs 43.

The pairs of plates 44 and 45 are slightly greater in length than theplates 43, and extend -V a distance below the member 4|, being joinedtogether by blocks 45, to which they are secured, as by screws 4|.Supporting members 46 are secured to the guide members I3, as by screws41', and serve to hold the jointing plates in alined vertical-relation.Additional guide members 48 positioned interiorly of the members 43,

44 and 45 and secured to the members 43, as by screws 49, serve toretain the sides of the jointer block assembly in spaced relation to theguide members I3.

As best shown in Figures 2 and 4, the member 4| has secured thereto, asby a screw 50, a plate through which is passed an aperture in alignmentwith a suitable smooth bore 52 extending through the member 4|. Anadjusting screw 53 extends through the bore 52 and threadedly engages a.threaded recess 54 positioned in the lower surface of one of the membersI3. Thus, it will be seen that rotation of the adjusting screw 53 movesthe block 4| and correspondingly the side plates 43. Each of the members46 is secured to the block 4| by means of an adjusting screw 55 whichpasses through a smooth bore in the member 46 and threadedly engages inan aligned threaded aperture in the block 4|. Thus, movement of theadjusting screw 53 serves to move the entire assembly upwardly ordownwardly with respect to the members |3 and correspondingly the sawl2. Conversely, movement of either of the screws 55 serves only to moveits associated member 46, and accordingly only the side plates 44 or 45associated with the block 46.

The plates 43 are held in position, as by means of set screws 60 whichpass through suitable slots 6| in the plates and corresponding alignedslots 62 in the members 48 and engage in suitable threaded apertures inthe member I3. Correspondingly, the plates 44 and 55 are held inPosition, as by set screws 65, positioned in slotted apertures 66 andengaging in threaded apertures in plate 48.

From the foregoing, the operation of the device should now be readilyunderstandable. The chain saw I2 is iirst placed on the guide member I3and adjusted over the sprocket |9 and pulley |8 or 30, in accordancewith the length of the chain, and tensioned by means of the pulley 3|.The saw is then brought into position by movement of the handle 22 untila block of teeth, or group of four as above described, are aligned withrespect to the jointing block 4|), the cutting teeth being aligned withthe side plates 43 and 43. A straight edge is then placed transverselyacross one of the pairs of plates 43, set screw 59 loosened, and theassembly adjusted by means ofthe adjusting screw 53 until the tip of theassociated cutter tooth touches the straight edge. The members 43 maythen be locked in position by means of set screws B9. The straight edgeis now placed lengthwise of the jointing block 43, and the members 44and 45 independently adjusted by means of the screws 55, a feeler gaugeplaced beneath the straight edge being utilized to determine the propersetting of each of these members, in order to provide proper jointingfor the raker teeth.

After each group of teeth has been properly aligned, the chain is movedforwardly by means of the ratchet mechanism above described until thenext group of teeth is in proper alignment with the joining block. Thus,it will be seen that the entire chain may be joined in a singleoperation, without the necessity of readjusting the jointing block foreach diierent group of teeth.

It will be seen that the jointing block may be readily removed from theframe if desired and the frame utilized for the sharpening of othertypes of chain saws.

Now, from the foregoing, it will be seen that there is herein providedan improved saw frame and jointing block therefor which accomplishes allthe objects of this invention, and others, including many advantages ofgreat practical utility and commercial importance.

As many embodiments may be made of this inventive concept, and as manymodications may be made in the embodiment hereinbefore shown anddescribed, it is to be understood that all matter herein is to beinterpreted merely as illustrative and not in a limiting sense.

I claim:

l. A device of the character described comprising a guide adapted tosupport a chain saw including spaced parallel interconnected framemembers, a jointing block associated therewith including a base plate,spaced pairs of oppositely disposed side plates secured to said baseplate, means for adjusting said base plate and spaced pairs of sideplates with respect to said frame members to align the saw cuttingteeth, means between said side plates and said frame members for lockingthe same in adjusted position, a pair ,of spaced base plates disposedbelow said first mentioned base plate, spaced pairs of oppositelydisposed side plates secured to said spaced base plate, independentmeans extending through said spaced base plates and said rst mentionedbase plate for adjusting said base plates and attached side plates withrespect to said frame members to secure the proper jointing of the sawraker teeth.

2f. A device of the character described comprising a guide adapted tosupport a chain saw inplates, independent means extending through saidspaced base plates and said rst mentioned base plate for adjusting saidspaced base plates and attached side plates with respect to said framemembers to secure the proper jointing of the saw raker teeth, and meansfor moving said chain saw to the next adjacent group of teeth after agroup of teeth has beenproperly alined to eect the joining of the entirechain saW in a single operation Without readjusting the jointing blockfor each diierent group of teeth.

ARTHUR B. MYERS.

